mtd/rfd_ftl: don't cast away the type when calling add_mtd_blktrans_dev

Pass the actual mtd_blktrans_dev instead of casting the containing
structure to void *.

Signed-off-by: Christoph Hellwig <[e-mail]>
Signed-off-by: Miquel Raynal <[e-mail]>
Link: https://lore.kernel.org/linux-mtd/[e-mail]

drivers/mtd/rfd_ftl.c

···
 		printk(KERN_INFO PREFIX "name: '%s' type: %d flags %x\n",
 				mtd->name, mtd->type, mtd->flags);
 
-		if (!add_mtd_blktrans_dev((void*)part))
+		if (!add_mtd_blktrans_dev(&part->mbd))
 			return;
 	}
 out: